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AuxPowData.go
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AuxPowData.go
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package main
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"strconv"
"merkle-tree-and-bitcoin/hash"
"merkle-tree-and-bitcoin/merkle"
)
// AuxMerkleBranch 合并挖矿的 Merkle Branch
type AuxMerkleBranch struct {
branchs []hash.Byte32
sideMask uint32
}
// AuxPowData 辅助工作量数据
type AuxPowData struct {
coinbaseTxn []byte
blockHash hash.Byte32
coinbaseBranch AuxMerkleBranch
blockchainBranch AuxMerkleBranch
parentBlock []byte
}
// ParseAuxPowData 解析辅助工作量数据
/*
<https://en.bitcoin.it/wiki/Merged_mining_specification#Aux_proof-of-work_block>
? coinbase_txn txn Coinbase transaction that is in the parent block, linking the AuxPOW block to its parent block.
32 block_hash char[32] Hash of the parent_block header.
? coinbase_branch Merkle branch The merkle branch linking the coinbase_txn to the parent block's merkle_root.
? blockchain_branch Merkle branch The merkle branch linking this auxiliary blockchain to the others,
when used in a merged mining setup with multiple auxiliary chains.
80 parent_block Block header Parent block header.
*/
func ParseAuxPowData(dataHex string, chainType string) (auxPowData *AuxPowData, err error) {
auxPowData = new(AuxPowData)
data, err := hex.DecodeString(dataHex)
if err != nil {
return
}
if len(data) <= 80 {
err = errors.New("AuxPowData should be more than 80 bytes")
return
}
// 80 bytes of parent block header
auxPowData.parentBlock = make([]byte, 80)
copy(auxPowData.parentBlock, data[len(data)-80:])
// 因为解析 coinbase_txn 十分困难,且无法简单得到其准确长度,
// 所以决定先计算出 block_hash,然后从字节流中找到该 hash 以确定 coinbase_txn 的长度。
if chainType == "LTC" {
scryptKey, errScrypt := Scrypt(auxPowData.parentBlock)
if errScrypt != nil {
err = errors.New("Scrypt parentBlock failed")
return
}
auxPowData.blockHash.Assign(scryptKey)
} else {
auxPowData.blockHash = hash.Hash(auxPowData.parentBlock)
// BTCPool的默认字节序是 big-endian
auxPowData.blockHash = auxPowData.blockHash.Reverse()
}
// 从字节流中找到 block_hash 以确定 coinbase_txn 的长度
index := bytes.Index(data, auxPowData.blockHash[:])
if index == -1 {
/* 找不到,尝试 little-endian
* <https://en.bitcoin.it/wiki/Merged_mining_specification#Aux_proof-of-work_block>
* Note that the block_hash element is not needed as you have the full parent_block header element
* and can calculate the hash from that. The current Namecoin client doesn't check this field for
* validity, and as such some AuxPOW blocks have it little-endian, and some have it big-endian.
*/
auxPowData.blockHash = auxPowData.blockHash.Reverse()
index = bytes.Index(data, auxPowData.blockHash[:])
if index == -1 {
err = errors.New("cannot found blockHash " + auxPowData.blockHash.Hex() + " from AuxPowData " + dataHex)
return
}
}
// index 在数值上等于 coinbase_txn 的长度
auxPowData.coinbaseTxn = make([]byte, index)
copy(auxPowData.coinbaseTxn, data[0:])
// 跳过 block_hash
index += 32
// coinbaseBranchSize 为变长整数 <https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer> ,
// 但是不太可能超过 0xFD。所以假设 coinbaseBranchSize 只有一字节。
coinbaseBranchSize := int(data[index])
index++
// 读取 coinbase branch
auxPowData.coinbaseBranch.branchs = make([]hash.Byte32, coinbaseBranchSize)
for i := 0; i < coinbaseBranchSize; i++ {
copy(auxPowData.coinbaseBranch.branchs[i][:], data[index:])
index += 32
}
// 读取 coinbase branch 的 side mask
sideMask := make([]byte, 4)
copy(sideMask, data[index:])
auxPowData.coinbaseBranch.sideMask = binary.LittleEndian.Uint32(sideMask)
index += 4
// blockchainBranchSize 为变长整数 <https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer> ,
// 但是不太可能超过 0xFD。所以假设 blockchainBranchSize 只有一字节。
blockchainBranchSize := int(data[index])
index++
// 读取 blockchain branch
auxPowData.blockchainBranch.branchs = make([]hash.Byte32, blockchainBranchSize)
for i := 0; i < blockchainBranchSize; i++ {
copy(auxPowData.blockchainBranch.branchs[i][:], data[index:])
index += 32
}
// 读取 blockchain branch 的 side mask
sideMask = make([]byte, 4)
copy(sideMask, data[index:])
auxPowData.blockchainBranch.sideMask = binary.LittleEndian.Uint32(sideMask)
index += 4
// 验证最后是否只剩下80字节的区块头
extraDataLen := len(data) - index - 80
if extraDataLen != 0 {
err = errors.New("AuxPowData has unexpected data: " + strconv.Itoa(extraDataLen) +
" bytes between blockchainBranchSideMask and blockHeader")
return
}
// 数据合法,解析完成
return
}
// ExpandingBlockchainBranch 将特定币种的MerkleBranch添加到AuxPowData.blockchainBranch
func (auxPowData *AuxPowData) ExpandingBlockchainBranch(extBranch merkle.MerklePath) {
branch := &auxPowData.blockchainBranch
extBranchLen := uint(len(extBranch))
branch.sideMask = branch.sideMask << extBranchLen
extBranchItems := make([]hash.Byte32, extBranchLen)
for i := uint(0); i < extBranchLen; i++ {
extBranchItems[i] = extBranch[i].Hash
if extBranch[i].UseFirstInConcatenation {
branch.sideMask = branch.sideMask | (uint32(1) << i)
}
}
branch.branchs = append(extBranchItems, branch.branchs...)
}
// ToBytes 把AuxPowData转换为字节流
func (auxPowData *AuxPowData) ToBytes() (data []byte) {
// parent coinbase transaction
data = append(data, auxPowData.coinbaseTxn...)
// parent block hash
data = append(data, auxPowData.blockHash[:]...)
// parent coinbase branch
data = append(data, byte(len(auxPowData.coinbaseBranch.branchs)))
for _, branch := range auxPowData.coinbaseBranch.branchs {
data = append(data, branch[:]...)
}
sideMask := make([]byte, 4)
binary.LittleEndian.PutUint32(sideMask, auxPowData.coinbaseBranch.sideMask)
data = append(data, sideMask...)
// merged mining blockchain branch
data = append(data, byte(len(auxPowData.blockchainBranch.branchs)))
for _, branch := range auxPowData.blockchainBranch.branchs {
data = append(data, branch[:]...)
}
sideMask = make([]byte, 4)
binary.LittleEndian.PutUint32(sideMask, auxPowData.blockchainBranch.sideMask)
data = append(data, sideMask...)
// parent block header
data = append(data, auxPowData.parentBlock...)
return
}
// ToHex 把AuxPowData转换为十六进制字符串
func (auxPowData *AuxPowData) ToHex() string {
return hex.EncodeToString(auxPowData.ToBytes())
}